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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62c10bb9377c9a220d4a661e047cac6d7d536f954b282aba947f82137ec7554' 
  AND token = 'OPcH1lUHDdRNVwmpFjcREzWxEe9ucyRJbKS9se7FL+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}